AIRBORNE PARTICLE MOVEMENT IN A GENERIC INDOOR SPACE
The video clip below shows the results of computer modeling of a classroom type indoor space to demonstrate movement of small micron-sized particles carried on the room air currents. These particles could be biologically or chemically harmful and represent a health hazard via direct contact or inhalation. These models demonstrate that the conventional top-down mixing ventilation system common in the US promotes the dispersion of particles in indoor spaces. New ventilation methods are needed to sweep indoor spaces of these harmful particles. [Note that the sighted 20-deg inlet flow 'down-angle' is actually 5-deg in the Main clip. The second video clip below the Main sequence use a 20-deg 'down-angle'.]
Classroom Main Sequence with air inlet at a 20-deg down angle. 6-min of exhalation +6-min purge when view angle changes [real time].
AIRBOURNE PARTICLE MOVEMENT IN A QUIESCENT ROOM
Video clip of mannequin discharge into a quiescent room (mechanical ventilation off). Restful breathing rate. Discharge of 3-micron (Blue) and 50-micron (Red) particles normal to inlet on head. First half is with discharge; second half is without to demonstrate continued movement of particles due to thermal currents in room (discharge at 92degF with mannequin surfaces are at 85degF). Real time about 18-min.